By which of the following process permanent hardness of water can be removed, by adding 

By which of the following process permanent hardness of water can be removed, by adding 

  1. A

    Sodalime 

  2. B

    Sodiumbicarbonate 

  3. C

    Washing soda

  4. D

    Sodium chloride

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    Solution:

    Washing soda removes both the temporary and permanent hardness by converting soluble calcium and magnesium compounds into insoluble carbonates. 

    CaCl2+Na2CO3CaCO3+2NaClCaSO4+Na2CO3CaCO3+Na2SO4CaHCO32+Na2CO3CaCO3+2NaHCO3

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